Merge pull request #9879 from SimonCropp/remove-MSBuild.Sdk.Extras-and-AggregatePackage.NuGet.Sdk

remove MSBuild.Sdk.Extras and AggregatePackage.NuGet.Sdk

global.json

@@ -4,8 +4,6 @@
         "rollForward": "latestFeature"
     },
     "msbuild-sdks": {
-        "Microsoft.Build.Traversal": "1.0.43",
-        "MSBuild.Sdk.Extras": "3.0.22",
-        "AggregatePackage.NuGet.Sdk" : "0.1.12"
+        "Microsoft.Build.Traversal": "1.0.43"
     }
 }